In a school field,
27 of the students wore spectacles. After 66 students who wore spectacles entered the school field, the percentage of students who wore spectacles increased to 60%. How many students in the school field did not wear spectacles?
|
Wore spectacles |
Did not wear spectacles |
Before |
2x2 = 4 u |
5x2 = 10 u |
Change |
+ 66 |
|
After |
3x5 = 15 u |
2x5 = 10 u |
60% =
60100 =
35The number of students who did not wear spectacles remains unchanged. LCM of 5 and 2 is 10.
Number of students who wore spectacles and left
= 15 u - 4 u
= 11 u
11 u = 66
1 u = 66 ÷ 11 = 6
Number of students who did not wear spectacles
= 10 u
= 10 x 6
= 60
Answer(s): 60